摘要:
Lewis acid-mediated N-glycosylation of 2,3-dideoxyribofunanosides having a (diethoxyphosphorothioyl)difluoromethyl group at the 3alpha-position with silylated nucleobases was examined. The phosphorothioyldifluoromethyl was found to be an effective functional group for the diastereoselective synthesis of beta-N-1-pyrimidine-nucleotide analogues 26 and 28-30. However, the method was not useful for the diastereoselective synthesis of adenine nucleotide analogues. The nucleotide analogue 26 was transformed to the difluoromethylene-phosphonate analogue 31 of thymidine-3'-phosphate by oxidation with m-CPBA, followed by aqueous. work-up. (C) 2003 Elsevier Ltd. All rights reserved.